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LED Resistor

Calculate LED Resistor instantly with the exact formula and a worked example.

LED Resistor

Supply voltageV
U LEDV
LED currentmA
Resistor
150Ω
R = (Vs−Vled) / ICalculate LED Resistor instantly with the exact formula and a worked example.

More about: LED Resistor

What it calculates

The “LED Resistor” calculator computes Resistor in Ω from 3 parameters: supply voltage (V), u led (V), led current (mA).

A standard physics formula used in educational and engineering tasks.

Example calculation

With parameters Supply voltage = 5 V, U LED = 2 V, LED current = 20 mA the result is 150 Ω (R = (Vs−Vled) / I).

How to use

  1. Enter supply voltage, u led and led current — each field above is adjustable with a slider.
  2. Resistor (Ω) is calculated automatically as you type.
  3. Check the worked example below to see the formula applied to real numbers.
  4. Copy the result or bookmark this calculator.

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FAQ

How is LED Resistor calculated?
The LED Resistor calculator computes Resistor (in Ω) from supply voltage, u led, led current. Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the LED Resistor calculator free?
Yes. It is completely free, needs no signup, runs entirely in your browser, and sends no data to any server.

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